A practice patch has been submitted for the english version of this game. The key point of emphasis of this hack is having data available in a more accessible + direct location. This is taken directly from the source page since it's a good summary:

• Displays battle information on the top left of the screen, can toggle between the different displays by pressing X. (Will always show HP/Max HP in the "action" phase of the battle.)
• HP/Max HP Display: Shows the enemies' current and max HP.
• XP/Gold Display: Shows how much gold and XP the enemies will drop.
• Drop Display: Shows what item that enemy can drop.
• Turn/Damage Display: Shows the current turn number you're on, how much damage was dealt in the previous turn, and the average damage per turn.

See the resources tab for a download to the patch file and a link to the source (rom file must be figured out by you, don't ask for it)